Kohaku, a demon slayer from the *Inuyasha* universe, emerges as Sango’s younger brother and later a pivotal figure in its sequel *Yashahime*. Hailing from a lineage of demon slayers, his harrowing past begins when Naraku’s manipulation leads him to unwittingly slaughter his father and comrades during a mission, culminating in his death. Revived by Naraku with a Shikon Jewel shard embedded in his back, Kohaku becomes a mind-controlled puppet stripped of memories and autonomy, forced into missions such as stealing Inuyasha’s Tessaiga and guarding Rin. Fleeting moments of humanity surface during encounters with Sango and allies, hinting at his fractured conscience.

As fragmented memories return through these interactions, guilt and resolve collide within him. He feigns loyalty to Naraku while covertly sabotaging his schemes, protecting Sango during Mount Hakurei’s crisis and defying orders to harm innocents. Collaboration with the priestess Kikyō proves pivotal: her spiritual power purifies his Shikon shard, enabling its removal without fatal consequences.

Decades later, Kohaku ascends as chief of the demon slayers, bearing a nose scar earned while defending his nephew Hisui from a demon attack. In *Yashahime*, he mentors the next generation, including Sesshōmaru’s half-demon daughter Setsuna, whom he integrates into slayer ranks despite prejudice. His responsibilities expand to guarding Rin during her cursed slumber and aiding Sesshōmaru’s family, alliances forged through shared trials.

Now a tactician valuing strategy over recklessness, Kohaku imparts wisdom like strategic retreats to trainees such as Towa. Balancing leadership with personal bonds, he maintains a dry wit—joking about avoiding Sango’s chaotic household—while nurturing ties to Kirara and his sister’s children. His journey from trauma-bound pawn to self-possessed protector embodies redemption through perseverance, with relationships to figures like Kagura and Kikyō underscoring themes of agency and forgiveness. As a bridge between eras, he upholds demon-slaying traditions while adapting to new challenges, cementing his legacy as both warrior and unifier.